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Cisco 400-007 is a certification exam that tests the knowledge and skills of individuals in the area of network design. As part of the Cisco Certified Design Expert (CCDE) program, the exam is designed to validate the expertise of network designers in various industries, including service providers, large enterprises, and government agencies.

Cisco Certified Design Expert (CCDE) is a globally recognized certification that validates the expertise of network design engineers, architects, and experts. Cisco Certified Design Expert (CCDE v3.0) Written Exam certification is designed to help professionals acquire advanced technical knowledge and skills required for designing complex network infrastructures. The CCDE certification is highly valued and sought after by employers as it demonstrates the candidate's ability to design and implement complex network infrastructures.

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Cisco 400-007 exam consists of multiple-choice and scenario-based questions. 400-007 exam duration is 120 minutes, and candidates must score at least 80% to pass. 400-007 exam is available in English and Japanese languages. A CCDE certification is valid for three years, after which candidates must recertify by passing the CCDE practical exam or by earning credits through continuing education activities. Overall, the Cisco 400-007 Exam is a rigorous and comprehensive test that validates the candidate’s expertise in network design and architecture.

Cisco Certified Design Expert (CCDE v3.0) Written Exam Sample Questions (Q163-Q168):

NEW QUESTION # 163
In an OSPF network with routers connected together with Ethernet cabling, which topology typically takes the longest to converge?

A. Full mesh
B. Partial mesh
C. Squared
D. Ring
E. Triangulated

Answer: D

Explanation:
In OSPF, a ring topology typically converges more slowly because:
* Link failures can create longer SPF recalculations as alternate paths are fewer.
* Only one alternate path usually exists for each link failure, extending the time needed for failure detection and SPF recalculation.
CCDE v3.1 stresses that designs like full mesh or triangulated topologies provide faster convergence due to multiple available alternate paths, which reduce SPF computation complexity.
Why other options are incorrect:
* A, D, E: These topologies provide multiple paths.
* B: Full mesh offers immediate redundancy for any failure.
-

NEW QUESTION # 164
Which two mechanisms avoid suboptimal routing in a network with dynamic mutual redistribution between multiple OSPFv2 and EIGRP boundaries? (Choose two.)

A. matching OSPF external routes
B. route tagging
C. route filtering
D. route tagging
E. matching EIGRP process ID
F. AD manipulation

Answer: C,D

Explanation:
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/8606-redist.
html

NEW QUESTION # 165
Which function is performed at the access layer of the three-layer hierarchical network design model?

A. fast transport
B. fault isolation
C. redundancy and load balancing
D. QoS classification and marking boundary
E. reliability -

Answer: D

NEW QUESTION # 166
Which BGP feature provides fast convergence?

A. BGP PIC
B. BGP-LS
C. BGP-EVPN
D. BGP FlowSpec

Answer: A

Explanation:
* A (BGP PIC - Prefix Independent Convergence) enables BGP to rapidly converge during link or node failures by pre-installing backup forwarding paths in the FIB.
* BGP PIC minimizes traffic loss during failover, improving resiliency in both edge and core environments, and is a key recommendation for scalable and high-availability BGP design in CCDE v3.
1.
Why other options are incorrect:
* B: BGP-EVPN is used for L2VPN services, not for fast convergence.
* C: BGP FlowSpec is used for DDoS mitigation and traffic filtering.
* D: BGP-LS (Link-State) provides topology distribution for controllers, not convergence.

NEW QUESTION # 167
You are designing the QoS policy for a company that is running many TCP-based applications. The company is experiencing tail drops for these applications. The company wants to use a congestion avoidance technique for these applications. Which QoS strategy can be used to fulfill the requirement?

A. weighted fair queuing
B. first-in first-out
C. low-latency queuing
D. weighted random early detection

Answer: D

NEW QUESTION # 168
......

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